Bump markdown-to-jsx from 7.3.2 to 7.5.0 in /playground

Bumps [markdown-to-jsx](https://github.com/quantizor/markdown-to-jsx) from 7.3.2 to 7.5.0.
- [Release notes](https://github.com/quantizor/markdown-to-jsx/releases)
- [Changelog](https://github.com/quantizor/markdown-to-jsx/blob/main/CHANGELOG.md)
- [Commits](quantizor/markdown-to-jsx@v7.3.2...v7.5.0)

---
updated-dependencies:
- dependency-name: markdown-to-jsx
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>